title: Study of micro-channel geometries for internally cooled Si monochromators.
abstract: Rocking curves of micro-channel (MC) water-cooled monochromators are broadened by stresses introduced during fabrication and under X-ray thermal load. This is a problem which will be even more serious with the rise of the fourth-generation synchrotron sources, i.e. the free-electron lasers. The X-ray optics group at the Institute of Physics at the ASCR v.v.i. in Prague is designing, testing and, with company Polovodice a.s., fabricating novel internally water-cooled Si monochromators. Here three new micro-channel geometries are introduced which reduce rocking-curve enlargement owing to the fabrication to less than 2.5 microrad ( approximately 0.5 arcsec). All three MC designs show less rocking-curve enlargement and smoother topographic images. The designs also show better cooling efficiencies than the classical MC design in finite-element analysis calculations.
authors.affiliation: Institute of Physics, Academy of Sciences of the Czech Republic v.v.i., Na Slovance 2, 182 21, Praha 8, Czech Republic. oberta@fzu.cz
authors.forename: P
authors.initials: P
authors.lastname: Oberta
authors.forename: V
authors.initials: V
authors.lastname: Ac
authors.forename: J
authors.initials: J
authors.lastname: Hrdý
authors.forename: B
authors.initials: B
authors.lastname: Lukás
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008904:Miniaturization; D055096:Optical Devices; D012825:Silicon / Q000737:chemistry*; D013057:Spectrum Analysis / Q000295:instrumentation*; D013499:Surface Properties; D017356:Synchrotrons / Q000295:instrumentation*
chemical_list: D012825:Silicon